Abderrahim Belbali, Abdessalam Belbali, Mohammed Amine Gasmi, Samir Ouldbahammou, Ali Yousfat, Ahmed Oukacha Azizi. “Measuring and Analyzing Economic Diversification Using the Herfindahl-Hirschman Index”. European Economic Letters (EEL), vol. 14, no. 3, Oct. 2024, pp. 3025-37, https://eelet.org.uk/index.php/journal/article/view/2078.